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Bug #77495 STMT execute memory leak
Submitted: 2019-01-21 00:47 UTC Modified: 2020-12-27 04:22 UTC
Avg. Score:4.4 ± 0.8
Reproduced:4 of 4 (100.0%)
Same Version:2 (50.0%)
Same OS:3 (75.0%)
From: istvan at dupai dot hu Assigned:
Status: No Feedback Package: MySQLi related
PHP Version: 7.3.1 OS: Windows
Private report: No CVE-ID: None
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From: istvan at dupai dot hu
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 [2019-01-21 00:47 UTC] istvan at dupai dot hu
MySQLi prepared statement execution in a loop increases memory consumption rapidly constantly.

Test script:
$now = microtime(true);
$db = new \Mysqli("localhost", "root", "password", "database", 3306);

$stmt = $db->prepare("SELECT * FROM someTable WHERE id=?");
$stmt->bind_param("i", $id);

for( $id=1; $id<1000; $id++ ) {
    $result = $stmt->get_result();

echo "Time taken: ".(microtime(true)-$now)." seconds\n";
echo "Peak memory usage: ".number_format(memory_get_peak_usage())." bytes\n";

Expected result:
Memory usage should peak and stay around 400 KBs.

Actual result:
Memory usage constantly grows.


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 [2020-01-07 11:05 UTC] thomas dot kosel at aspera dot com
I can reproduce this on 7.3.6 in a docker environment
The issue did not apply, when the prepare and bind parts are in the loop too.
 [2020-12-18 09:42 UTC]
-Status: Open +Status: Feedback
 [2020-12-18 09:42 UTC]
I can't reproduce this. I think early 7.3 versions did have issues with result set leaks, so I suspect this has already been fixed in the meantime. Do you still see this issue?
 [2020-12-27 04:22 UTC] php-bugs at lists dot php dot net
No feedback was provided. The bug is being suspended because
we assume that you are no longer experiencing the problem.
If this is not the case and you are able to provide the
information that was requested earlier, please do so and
change the status of the bug back to "Re-Opened". Thank you.
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